This video is a tutorial on how to water your lawn in an environmentally friendly way. He begins by stating that watering your lawn in the middle of the day is the wrong time. The sun is at its highest and the lawn is already scorched. The water you are spraying around does not get absorbed into the soil, it evaporates. The best time to water your lawn is at night because you create a fungus over the soil that protects it from be sun. You can put a water timer on your hose to prevent over-watering the grass.